Jboss/Tomcat Behind router

I have a web application deployed in Jboss. Accessing http://localhost:8080 && http://<system IP in LAN >:8080 works fine. But when i use the ip provide by By ISP http://< IP from ISP >:8080 it doesnt work. I have done port forwarding in the router configuration to 8080 for the System IP. Tested port forwarding & its OK. How can i access the web application from outside network [internet].